You could achieve the exact same benefits from masturbation. The difference is, masturbation won't give you Aids or other STD's, and can not lead to "accidents.
First off, here's my argument on the blower. AID's and sex go hand in hand. You might as well inject yourself with the virus, since you're so willing to put it in your mouth. That goes for all STD's.
Here's my argument for the one on the receiving end. How many of you guys have ever gotten your "member" caught in your fly? Imagine that, but with larger teeth, and muscles capable of exerting hundreds of pounds of force with one involuntary jerk reaction. The risks with oral sex outweigh the benefits, and in reality, is a safety risk that people should avoid.

It all depends on how you look at it. If its a married couple then sure, have all the oral sex you want. However if you are just getting random people to do it then it is definitely not good and has a lot of risk.